Boat Definition and 362 Threads

An assumption that arises periodically and many times recently across a number of threads is that we are all driven by motives such as wealth or power. Now I have no personal experience about being really wealthy. My income has varied between nothing and 350K/yr. The odd thing is that when I...

All, I am an avid kayaker, and recently got into an argument with another kayaking friend of mine over (what I think is) an issue of relative velocity. The question was this: A person is sitting in a kayak and that kayak is in a constant velocity current (say, 3 knots), but the kayak is...

Hi, I have a question regarding the forces involved in an inclined elevator boat lift. Attached is a diagram of the setup. I was wondering what forces are involved. I know that there is a torque that is exerted on the inclined arm equal to the weight of the boat times the distance of the...

Homework Statement A Family has a boat which can travel at 12 m/s in still water. They are using it to reach a point 500m downstream on the other side of a river 300m wide, and flowing at 4 m/s. What heading must they take, relative to their starting point, in order to reach their destination...

I am trying to build my own boat lift that uses plastic tanks submerged to lift the boat when they become filled with air. My problem is that I need to lift about 10,000 lbs and i don't know how large the tanks need to be ( how much water they need to displace ) to lift that amount of weight...

[b]1. The bottom of a steel "boat" is a 4.00 m x 10.0 m x 4.00 cm piece of steel (rho=7900). The sides are made of 0.490 cm-thick steel. Homework Equations Fbouy = Wobj The Attempt at a Solution i have gone around in so many directions that I am pretty much lost...is okay to...

Homework Statement A 600- kg ice boat moves on runners on essentially frictionless ice. A steady wind blows, applying a constant force to the sail. At the end of an 7- s run, the acceleration is 0.4 m/s2. What was the acceleration at the beginning of the run? Answer: 0.4m/s What was the...

A boat(1500kg) is on a lake exibiting SHM with an amp of 20cm bobbing on the waves. The boat takes 3.5s to make one complete up and down cycle. When the boat is at its highest point it is at the same level as the dock. You will only board the boat if it is within 10cm of the dock. How much...

The U.S. coast guard is attempting to justify sending machine guns to patrol the Great Lakes, in response to the endemic terrorism in that region: (NYT) One might suggest northern Minnesota is an odd place to spend federal anti-terrorism money...

a boat moves through the water with 2 forces acting on it. one is a 2021N forward push by the motor on the propeller, and the other is an 1774N resistive force due to the water around the bow. What is the acceleration of the 1146kg boat? Answer in units of m/s^2. would i use a=f/m for this...

Information given: boat owner pulls her boat into the dock shown, where there are six capstans to which to tie the boat. She has three ropes. She can tie the boat from the boat's center (A) to any of the capstans (B through G) along the dotted arrows shown. Suppose the owner has tied...

There is only one boat. The boat can support a tiger and it's owner, or 2 owners. There are 3 tigers and 3 owners. When a owner leaves a tiger alone, the tiger will eat everything around it (tigers or humans). One of the tigers can row the boat. How do you get all the tigers and their owner...

http://img517.imageshack.us/img517/6533/c6p4ty2.jpg The drawing shows a boat being pulled by two locomotives through a canal of length 1.04 km. The tension in each cable is 4.27 x 103 N, and theta = 20.0o. what is the net work done on the boat by the two locomotives? Here is what I've...

A sailboat tacking against the wind moves as follows: 5.8 km at 45 degrees east of north, and then 4.5 km at 50 degrees west of north. The entire motion takes 1 h 15 min What is the total displacement? What is the average velocity of this section of the trip? What is the speed, if it is...

A boat that can travel at 4.0 km/h in still water crosses a river with a current of 1.8 km/h. At what angle must the boat be pointed upstream to travel straight across the river? In other words, in what direction is the velocity of the boat relative to the water? I have already found the...

I have a question about a physics problem, this comes from Barger's Classical Mechanics: A boat is slowed by a drag force, F(v) and its velocity decreases according to the formula v=c^2(t-t_{1})^2 where c is a constant and t_{1} is the time at which it stops. Find the force F(v) as a function...

A friend of mine emailed me this question: At first glance, I expected it to be easy, but I'm really not sure what the answer is! Drafting in a car works because the rear car pushes a high pressure area in front of it, partially filling the low pressure area behind the lead car, reducing...

http://media.putfile.com/HydroFoam Something Cyrus might appreciate and enjoy. :biggrin:

Im standing on a shoe box shaped boat, I put myself on the front of it and start jumping Will i be propelled backwards of forwards, why? Thanks in advance

in a water tank involving the launching of a small model boat,the model's initial horizontal velocity is 20ft/s and its horizontal acce varies linearly from -40ft/s^2 at t=0 to -6ft/s^2 at t=t(1) then remains equal to -6ft/s^2 until t=1.4s.Knowing that v=6ft/s when t=t(1), determine the value of...

A boat moves through the water with two forces acting on it. One is a 2000 N motor, and the o ther is an 1800 N restive force to the water. 1) What is the accelration of the 1000 kg boat? Did I do this right? a) (2000 cos 90 + 1800 cos 270 ) i + (2000 sin 90 + 1800 sin 270)j = 3800j N...

Two ferryboat each traveling at different constant speed start at the same instant from opposite sides of the Hudson River, one going from New York City to Jersey City and the other from Jersey City to New York City. They pass one another at a point 720 yard from New York City shore. After...

The drawing shows a boat being pulled by two locomotives through a canal of length 2.39 km. The tension in each cable is 4.17E4 N, and = 16.7°. What is the net work done on the boat by the two locomotives? first I used W=fd... i multiplied 4.17E4 * 2 = 8.34E4 to get the total tension in...

I have a worksheet I received for make-up since I was absent. It is really hard since I miss the lesson. All the problems are similar, but I do no know where to start. Here is a sample problem. Will someone show me steps on how to do it? A boat moves through the water with two forces acting...

A boat with a windmill rotating a water propeller can sail directly upwind. It has been done many times, so take that as a given. (The maximum speed so far is about 0.5 times the speed of the wind. For a land yacht, the maximum speed so far is about 1.0 times the speed of the wind.) My...

i used to do model rocketry but have given it up for some time...i was rummaging through old stuff and found about 10 C-sized motors and began thinking what i could do with them. if i find some spare time i might make a simple rocket car or rocket boat. however, do ppl have tips (other...

Assume a windmill boat is drifting down a fast flowing river during windless conditions. It uses its relative wind to outrun the speed of the river. What is the correct way to describe this situation in terms of energy and power? Can we say that its energy is derived from the river but its power...

Now where have I heard about this before...? :rolleyes: http://www.katu.com/stories/78092.html

Can anyone provide advice for this? We will be putting them in the school's pool and racing them. But I really want some advice. (1) Formulas to find if the boat will float or sink (we'll be able to make measurements and stuff). (2) Plan ideas. (3) Stuff to focus on in building. We...

I need to calculate the bouyant force of a cardboard boat and the bouyant force exerted by the water. What is the equation to do this? Also, I need to the volume of water the boat displaces. (Density of water is 1000 kg/m^3). And last but not least, I need to determine the water level on...

When seen from the left side of the boat it goes toward the rear. When seen from the right side of the boat it goes toward the front. When seen from behind the boat it goes toward the right side. What is it?

Has anyone developed an approximation for the effects of different heights of sea waves on a pleasure boat performance? For example, if in calm water, a powerboat's speed is 20 kts., what would that boat's speed be if the sea conditions changed to 4-6 ft waves while holding all the other...

A boat of mass 250kg is coasting, with its engine in neutral, through the water at speed 3.00m/s when it starts to rain. The rain is falling vertically, and it accumulates in the boat at the rate of 10.0kg/hr. Assume that the boat is subject to a drag force due to water resistance. The drag is...

Two horses on either side of a canal pull a canal boat of mass 1.0*10^4 kg at a constant speed for a distance of 10.0 km. (Figure 7.32). One horse exerts a force of 3.0*10^2 N at an angle of 20º to the canal, and the other exerts 5.0 * 102 N. Find the work done by each horse and the work done...

A boat of mass 250 kg is coasting, with its engine in neutral, through the water at speed 3.00 m/s when it starts to rain. The rain is falling vertically, and it accumulates in the boat at the rate of 10.0 kg/hr. using this formula: mb*vb/(mb+k0+t1) i got an answer of 2.86, but it's...

A boat made a round trip of 3km on a river in 2h. The speed of the river's flow was 1m/s. In what time will the boat complete the same round trip, if the speed of the flow is 2 times smaller? I suck at these kinds of questions, so would anybody please help me out here? - Kamataat

i am building a human powered boat for my physics class. does anyone have any design tips or powering mechinisms that could be of use? please help me!

does anyone know of recycleable materials (strongest and less dense than water) that can be used to build a human powered boat?

Bernie is showing Margaret his new boat and its auto-navigation feature, of which he is particularly proud. "The island is 1 km east and 3 km north of this dock. So I just punch the numbers like this, and we get ourselves refreshment and enjoy the scenery." 45 min later, they find themselves...

Help Please! I've been working on this problem for 3 hours atleast now. I just need to know how to work it. The problem has a boat moving southeast at 0.380 m/s relative to the earth, and the river is flowing east at 0.460 m/s relative to the earth. I need to know how to get the veloctiy of the...

I know i need to use a simple vector diagram ...but I'm not sure how to set it up... In what direction should a boat point if it has a speed of 10 m/s, and wants to end up directly across a river with a current of 5 m/s. help? :confused: :bugeye: :rolleyes:

A Trailer carrying a boat is supported by a scale which initially reads 48-kg. The boat (and therefore its centre of gravity) is moved 0.15-m further back on the trailer. The scale now reads 37-kg. Find the mass of the boat. Kinda looks like this: _______\___boat___/__...

1. A 75KG man stands in a 100kg rowboat at rest in still water. He faces the back of the boat and throws a 5kg rock out of the back at a speed of 20 m/s. The boat recoils forward 4.2 m.. Calculate the initial recoil spped of the boat, the loss in mecahnical energy due to friction, the effective...

The bottom of a steel "boat" is a 6.00 m x 9.00 m x 5.00 cm piece of steel(density of steel = 7900 kg/m^3) . The sides are made of 0.460 cm-thick steel. what minimum height must the sides have for this boat to float in perfectly calm water? in cm i have that F_B (buoyancy force) is equal...

hey A 1000 kg boat is traveling at 90km/h when its engine is shut off. The magnitude of the frictional force between boat and water is proportional to the speed v of the boat: force of kinetic fricition=70v, where v is in meters per second and the force is in Newtons. Find the time required...

hi all, i am just wondering... if there is a guy has to jump off a small boat (u know... those have no engine, and etc... just a small wooden boat) which is stay stationary in calm water and is about to explode (for some reason... ). so yeh, that guy has to jump off the boat from one of the...

A boat travels east at 5.0 m/s. A sudden gust of wind gives the boat an acceleration of (.80m/s^2, 40 degress north of east). What is the boat's speed and direction 6.0 s later when the gust subsides.

2 man, mass m1 and m2 stands on a boat mass M at L distance apart on static water. they slowly swop their places. find the distance the boat move due to this. ------------------------------------------------------------ i know that the centre of mass remains unchange, and at start...

Let me know if the following statement is wrong : If a boat is going to cross a river directly ( i.e perpendicularly ) the x, horizontal, component of the boat velocity must be cancelled, that's be equal, by the water stream vector. I followed this idea in a problem but my answer is not...

what is the formula for calculating water displacement. I used to know it. it was something simple like length times width times .85 I think. Can anyone help me calculate the total displacement for a barge 295 feet long 52 feet wide with a designed dwaterline depth of 9 feet...